BZX84J-B39,115 Equivalent & Substitute Parts

Part Overview

The BZX84J-B39,115 is a 39 V Zener diode manufactured by Nexperia USA Inc., rated for 550 mW power dissipation in a surface mount SOD-323F package. This component is classified as an active product with automotive-grade qualification (AEC-Q101) and is ROHS3 compliant. Equivalent and substitute parts are identified when applications require alternative sourcing, inventory availability, or specific packaging configurations while maintaining functional compatibility within the 39 V Zener voltage class.

Key Parameters

Parameter	Value
Voltage - Zener (Nom) (Vz)	39 V
Power - Max	550 mW
Tolerance	±2%
Impedance (Max) (Zzt)	75 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 27.3 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA
Operating Temperature	-65°C ~ 150°C
Package / Case	SOD-323F
Mounting Type	Surface Mount
Grade	Automotive
Qualification	AEC-Q101
RoHS Status	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)

Substitute Part Grouping Explanation

Substitution of the BZX84J-B39,115 is determined by the following critical parameters:

Primary Substitution Criteria:

Zener voltage (Vz) must equal 39 V nominal
Operating temperature range must encompass -65°C ~ 150°C
Surface mount mounting type required
ROHS3 compliance and MSL 1 rating maintained

Secondary Compatibility Factors:

Power rating (550 mW maximum for primary part; lower ratings acceptable for reduced power applications)
Tolerance specification (±2% preferred; ±5% acceptable with design margin verification)
Package form factor (SOD-323F primary; SOD-523 represents different footprint)
Impedance characteristics (75 Ohms nominal; variations within 122 Ohms acceptable depending on circuit requirements)

Substitute parts MM3Z39VB, MM3Z39VC, and BZT52C39T-TP meet the core voltage and temperature requirements. Differences in power dissipation, impedance, and tolerance specifications define their application scope.

Parameter Comparison

Parameter	BZX84J-B39,115 (Main)	MM3Z39VB	MM3Z39VC	BZT52C39T-TP
Manufacturer	Nexperia USA Inc.	onsemi	onsemi	Micro Commercial Co
Voltage - Zener (Nom) (Vz)	39 V	39 V	39 V	39 V
Tolerance	±2%	±2%	±5%	±5%
Power - Max	550 mW	200 mW	200 mW	100 mW
Impedance (Max) (Zzt)	75 Ohms	122 Ohms	122 Ohms	130 Ohms
Current - Reverse Leakage @ Vr	50 nA @ 27.3 V	45 nA @ 27.3 V	45 nA @ 27.3 V	100 nA @ 27.3 V
Voltage - Forward (Vf) (Max) @ If	1.1 V @ 100 mA	1 V @ 10 mA	1 V @ 10 mA	900 mV @ 10 mA
Operating Temperature	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C	-65°C ~ 150°C
Package / Case	SOD-323F	SOD-323F	SOD-323F	SOD-523
Mounting Type	Surface Mount	Surface Mount	Surface Mount	Surface Mount
RoHS Status	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant	ROHS3 Compliant
Moisture Sensitivity Level (MSL)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)	1 (Unlimited)
REACH Status	REACH Unaffected	REACH Unaffected	REACH Unaffected	REACH Unaffected

Engineering Selection Recommendations

BZX84J-B39,115 (Primary Part) Select this part for applications requiring maximum power dissipation (550 mW), tighter tolerance specification (±2%), and automotive-grade qualification (AEC-Q101). The lower impedance (75 Ohms) provides superior voltage regulation characteristics. Nexperia manufacturing ensures consistent quality for automotive and industrial applications.

MM3Z39VB (onsemi, Cut Tape Packaging) This substitute is suitable for applications with power requirements up to 200 mW and tolerance specifications of ±2%. The SOD-323F package matches the primary part footprint. Select this part when onsemi sourcing is preferred and power dissipation does not exceed 200 mW. Cut Tape packaging supports lower-volume production runs.

MM3Z39VC (onsemi, Tape & Reel Packaging) This substitute is functionally equivalent to MM3Z39VB with identical electrical specifications but differs in tolerance (±5%) and packaging format (Tape & Reel). Select this part for high-volume manufacturing requiring automated tape-fed assembly. The ±5% tolerance is acceptable for applications with design margin accommodation. Highest inventory availability (10,028 pcs) supports production continuity.

BZT52C39T-TP (Micro Commercial Co, Tape & Reel Packaging) This substitute operates at reduced power dissipation (100 mW) with ±5% tolerance and SOD-523 package form factor. The different package footprint (SOD-523 vs. SOD-323F) requires PCB layout modification. Select this part only when the SOD-523 footprint is compatible with board design and power requirements do not exceed 100 mW. Higher impedance (130 Ohms) affects voltage regulation performance.

Frequently Asked Questions (FAQ)

Q: Can MM3Z39VB directly replace BZX84J-B39,115 on the same PCB?

A: Yes. MM3Z39VB shares the identical SOD-323F package footprint and surface mount configuration. Both parts operate across -65°C ~ 150°C and maintain ROHS3 compliance. The ±2% tolerance specification matches the primary part. Power dissipation is reduced to 200 mW, which is acceptable for applications not requiring the full 550 mW rating.

Q: What is the impact of selecting MM3Z39VC with ±5% tolerance instead of ±2%?

A: The ±5% tolerance specification increases the acceptable Zener voltage range from 38.22 V ~ 39.78 V (±2%) to 37.05 V ~ 40.95 V (±5%). Circuit designs must accommodate this wider voltage variation through appropriate margin allocation in voltage regulation and protection circuits. Applications with strict voltage regulation requirements should retain the ±2% tolerance specification.

Q: Why does BZT52C39T-TP use a different package (SOD-523) than the primary part (SOD-323F)?

A: SOD-523 is a smaller package form factor compared to SOD-323F. This package difference requires PCB layout modification and is not a direct footprint replacement. Select BZT52C39T-TP only when the SOD-523 footprint is already incorporated into board design or when space constraints necessitate the smaller package.

Q: Are all substitute parts automotive-grade qualified?

A: The primary part BZX84J-B39,115 carries AEC-Q101 automotive qualification. The substitute parts (MM3Z39VB, MM3Z39VC, BZT52C39T-TP) do not list automotive qualification in the provided specifications. Applications requiring automotive-grade components should retain the BZX84J-B39,115 primary part.

Q: What is the significance of impedance differences between parts?

A: Impedance (Zzt) affects voltage regulation performance and transient response. The primary part BZX84J-B39,115 has 75 Ohms impedance, while substitutes range from 122 Ohms to 130 Ohms. Higher impedance results in greater voltage variation under load changes. Applications requiring precise voltage regulation should prioritize lower impedance specifications.

Q: Can BZT52C39T-TP be used in high-volume production?

A: Yes. BZT52C39T-TP is supplied in Tape & Reel (TR) packaging, which is standard for automated assembly processes. However, the reduced power rating (100 mW) and higher impedance (130 Ohms) limit its application scope compared to the primary part. Verify that circuit power requirements do not exceed 100 mW before selecting this part for production.

Q: What packaging options are available for the 39 V Zener diode substitutes?

A: Two packaging formats are available: Cut Tape (CT) & Digi-Reel® for lower-volume applications (BZX84J-B39,115 and MM3Z39VB), and Tape & Reel (TR) for high-volume automated assembly (MM3Z39VC and BZT52C39T-TP). Package selection depends on production volume and assembly process requirements.

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